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Ultrahigh-strength precipitation strengthening steel and preparation process and application thereof

A technology of precipitation strengthening and preparation process, applied in the field of steel production, can solve the problems of heavy tank body, poor wear resistance and corrosion resistance, cracking, etc. Effect

Active Publication Date: 2021-08-06
SHOUGANG CORPORATION
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] In order to solve the technical problems of low strength level, insufficient wear resistance and corrosion resistance of existing steel for stirring tanks, the present invention provides an ultra-high strength precipitation-strengthened steel, which has high strength, high wear resistance, high Corrosion and good weldability solve the problems of high-strength steel plate cold forming cracking, heat-affected zone softening after welding, poor wear resistance and corrosion resistance, heavy tank body, etc.

Method used

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  • Ultrahigh-strength precipitation strengthening steel and preparation process and application thereof
  • Ultrahigh-strength precipitation strengthening steel and preparation process and application thereof
  • Ultrahigh-strength precipitation strengthening steel and preparation process and application thereof

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Embodiment

[0084] The present invention provides 8 embodiments and 2 comparative examples.

[0085] The chemical composition of a steel for an ultra-high-strength stirring tank is: C: 0.17%-0.22%; Si: 0.35%-0.55%; Mn: 1.70%-2.00%; Alt: 0.015-0.060%; P: ≤ 0.015%; S: ≤ 0.004%; Cr: 0.30% ~ 0.60%; Ti: 0.18% ~ 0.26%, B: 0.0007-0.0018%, Sn: 0.035 ~ 0.055%, the rest is iron and unavoidable impurities.

[0086] The concrete smelting chemical composition of embodiment 1-8 and comparative example 1,2 is shown in Table 1:

[0087] The slab chemical composition (%) of table 1 embodiment 1-8 and comparative example 1,2

[0088] serial number C Si mn P S Alt Ti Cr B sn Example 1 0.18 0.40 1.83 0.010 0.002 0.032 0.19 0.52 0.0009 0.040 Example 2 0.19 0.42 1.96 0.009 0.003 0.038 0.20 0.45 0.0012 0.035 Example 3 0.20 0.55 1.70 0.011 0.002 0.041 0.25 0.30 0.0017 0.042 Example 4 0.22 0.48 1.79 0.012 0.003 0.035 0.18 0.42 0....

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Abstract

The invention provides ultrahigh-strength precipitation strengthening steel, and belongs to the technical field of steel production. The ultrahigh-strength precipitation strengthening steel comprises the following chemical components in percentage by mass: 0.17%-0.22% of C, 0.35%-0.55% of Si, 1.70%-2.00% of Mn, 0.015%-0.060% of Alt, less than or equal to 0.015% of P, less than or equal to 0.004% of S, 0.30%-0.60% of Cr, 0.18%-0.26% of Ti, 0.0012%-0.0023% of B, 0.035%-0.055% of Sn and the balance of iron and inevitable impurities. The metallographic structure of the steel comprises, by area fraction, 83%-95% of bainite and / or acicular ferrite and 3%-17% of polygonal ferrite. The steel has high strength, high wear resistance and high corrosion resistance. The invention further provides a preparation process and application of the ultrahigh-strength precipitation strengthening steel.

Description

technical field [0001] The invention belongs to the technical field of steel production, and in particular relates to an ultra-high-strength precipitation-strengthened steel and its preparation process and application. Background technique [0002] With the continuous and rapid development of my country's infrastructure projects, the concrete industry has ushered in a stage of rapid development, and concrete machines are growing towards lightweight, large-scale, high-end, and integrated. Concrete mixer truck is a special truck used to transport concrete for construction; because of its shape, it is also often called snail truck. This type of truck is equipped with a cylindrical mixing drum to carry the mixed concrete, and the mixing drum will always be kept rotating during transportation to ensure that the carried concrete will not solidify. After the concrete is delivered, the inside of the mixing drum is usually washed with water to prevent the hardened concrete from taki...

Claims

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Application Information

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IPC IPC(8): C22C38/38C22C38/32C22C38/28C22C38/06C22C38/02C21D8/02
CPCC22C38/38C22C38/32C22C38/28C22C38/06C22C38/02C22C38/008C21D8/0205C21D8/0226
Inventor 潘辉刘锟牛涛田志红张旭郭慧敏李飞王松涛
Owner SHOUGANG CORPORATION
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